Pneumatic holder for commutator-brushes.



No; 884,049. PATENTE-D- APR. 7,1908;

' W. SPBIR-S'. v

PNIBUMATIG HOLDER POR GOMMUTATOR BRUSHES. APPLIQATION YULED'PBB. 23. 1907.

z sums-.SHEET 1.,

'PATENTED APR. '7, 1908.

o. W". SPBIRS. PNEUMATIG HOLDER PoR COMMUTATOR.l BRUSHES.

APPLICATION IILED PEB. 23. 19.07.

2 SHEETS-SHEET 2.v

-or instance, in the manner indicated in Fig.A Il. be positively guided in its movementbut must be'iree to tilt es shown in Fig. fl ores in Fig. 3 to maintain equal pressure on both brushes inA case one brush should weer fester than the other. f

With the arrangement hereinbeiore der'.

scribed, Whenfthe chamber or accumulator' from which airis supplied to the extensible chamber has been pumped up tothe desirel extent a constant 'and uniform pressure of the? brush upon tile comniutetor caribe meintained.

'ln the arrangement shown in Fig. Si the. mein passage le in the'plug lag which clamps the bag j to the spigof.r stopped by apiece of sheet rubber er the like -m und e small channel et is formed in the said plug leading from the exterior` thereof to the lc', the plug being u looseiit within the spigot .and held in place together with the rubberjm by ft screwed. blocl o liuvmg u. hole p and.. a groove g whereby the vlluid een 'ob tain access to the rubber m und passage n respectively. lf therefore the should burst the rubber lm` will be caused by the pressure of the fluid .above it to assume the 'position indicated by the dotted linesv and seal the channel ny and prevent the escape oi' the iluid from the vreservoir und other brusn holders connected therewith. y

Having now particularly deseribe'd and ascertained the nature oi my said invention n and in what manner the sume is to be performed i declare that-'what l claim ist l. The combination with s. couimutzitor brush movable toward the connuutator, of a flexible and extensible chmnben ineens for continuously supplying luid under pressure to said chamber, seid chamber being operetively connected'. With said coininutei'or brush to maintain it in contact with the coni mutzttor and compensate for Wear, whereby leakage of the pressure fluid is prevented, substantially as described.

2. The combinationwvith a coumiutnlor brush movable toward the conirnutetor, ol e flexible end extensible chamber, nieuiis for continuously supplying lluid under dress ure to seid chamber, means for preyenti v la tei al er: pansion of said chamber, seid chan'iber hav-` ing e part operatively connected tlufrewd-li engaging seid commutator brush to coni pensate for the weer thereof und maintain in contact with the commu zur, .vherebjf leak-ege et' the pressure fluid is prevented, substantially as described.

, The combination with u comni'ututor li rush movable toward the commutator, of .uff guiding member, e longitudinally niovnble member slidingly mounted in said guiding member, said slidinr member having e, part in this cese the air bagj must' not "'e'ngnging seid crurnnutator-brush, a flexible end extensible cliah'iber havinge part engag ing seid sliding member und means for continuously'supplying fluid under pressure to seid chamber, uflierebyssid chamber forces' seid sliding member .and said brush toward the cominutslor and maintains seid 'brush in contact therewith, substantially 'as 'de scribed. I

The combination.with a comniutatr brush movable towerd thercommutateur, 'of a statirmnry' guide for seid ll'ruslyi, 'ci' flexible und extensible chamber, meunslorcontinuously supplying fluid uinlerpressure to said chamber, means ier prevent-ing "lateral er:- pansion ci seidfcinuujier, said' chamber hetrm leren-'ith 'engaging said amber withinsaid tubes, and ineens ior continuously supplying fluid under pressure to seid chamber, whereby said chamber will compensate furthe wear of seid brush und maintain it in contect with the commututor, substantially es described. fhe conibination with a coninfiutator s rble toward the connuutstor, of u l`seid brush, ofY a pair of tubes,l one sliding within the other und one of seid tubes bring stationery, u flexible zuid extensible niber `citliin said tubes end ineens for emiitiuuously supplying luid under pressure to said chamber', whereby seid chamber will compensate for the weer of said brush and u'raintain it in contact with the cornmutator, substantially as dcfscr'bed.

7. The combination with a connnutator' brush movable toward the commutetor, of a pairoi tubes one sliding Within the other und lie outside tube being; stationary, e 'flexible und expzinsible chamber within said 'inner tube, seid inner tube pr a-,-\fe1i.ting lateral expansion ol seid chamber and lrictional con tsct with said shitionurif tube, seid sliding tube huving a purt me ve. ble therewith engagsuid brush, und means for continuously supplying .fluid under iiiressure to said churn ber, ton'ieiutiiu said brush in eonmctwith the conniuitutin and compensate ler the weer thereof, subs'zixnlielly es described.

The combination y. rl u'cornnnitator bru u movable toward the eonnnutetcr, of u flexible und extensible chamber, means tor continruuisly supplying Vfluid under pressure to said chamber, said chamber having e ypart movable therewith en iging seid brush to compensate vfor the'eer thereof und maintain it in Contact with the cornmut'etor and ils means 'for automatically cut-ting olf the supply of fluid to" said chamber iii case ot' leakage of the luid therefrom, substantially 'as described. l

9.The combination with a eommutator vbrush movable toward .the eommutator, of a flexible and expansible chamber having a part movable therewith engaging said brush, means for continuously supplying fluid under pressure to said chamber, said means includ- 4 mg a spigot having a main passage extend# m'g therethrough, and a 'branch f passage in communication with said maini passage, and

a Valve in said main passage adjacent to the erltvrance of said branch passage into said main passage, said valve closing said main passage' and 'beingadapted to close said branch passage When the pressure in the s )igot is greater than the pressure in said e amber, substantially as described.

' CHARLES WILLLXM SPEIRS.

VVit'nesses :f

JOHN E. BOUSFIELD,

E, E; DABBS. 

